package com.yupi.yupicturebackend.utils;

import cn.hutool.core.util.IdUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.crypto.digest.DigestUtil;
import cn.hutool.http.HttpRequest;
import cn.hutool.http.HttpResponse;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.yupi.yupicturebackend.model.dto.blockchain.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.time.LocalDateTime;
import java.util.*;
import java.util.concurrent.CompletableFuture;

/**
 * 区块链NFT工具类
 * 
 * <p>支持图片NFT铸造、区块链存证、数字资产交易、版权确权等Web3功能</p>
 * 
 * @author yupi
 */
@Slf4j
@Component
public class BlockchainNFTUtils {

    // 区块链网络配置
    private static final String ETHEREUM_RPC = "https://mainnet.infura.io/v3/";
    private static final String POLYGON_RPC = "https://polygon-rpc.com/";
    private static final String BSC_RPC = "https://bsc-dataseed.binance.org/";
    private static final String IPFS_GATEWAY = "https://ipfs.io/ipfs/";
    private static final String PINATA_API = "https://api.pinata.cloud/";

    /**
     * 铸造NFT
     *
     * @param imageUrl 图片URL
     * @param nftConfig NFT配置
     * @return 铸造结果
     */
    public static NFTMintResult mintNFT(String imageUrl, NFTConfig nftConfig) {
        try {
            log.info("开始铸造NFT: {}", nftConfig.getName());
            
            // 1. 上传图片到IPFS
            String imageHash = uploadToIPFS(imageUrl);
            
            // 2. 创建元数据
            NFTMetadata metadata = createNFTMetadata(nftConfig, imageHash);
            
            // 3. 上传元数据到IPFS
            String metadataHash = uploadMetadataToIPFS(metadata);
            
            // 4. 调用智能合约铸造NFT
            String transactionHash = mintNFTOnChain(nftConfig, metadataHash);
            
            // 5. 构建返回结果
            NFTMintResult result = new NFTMintResult();
            result.setSuccess(true);
            result.setTokenId(generateTokenId());
            result.setContractAddress(nftConfig.getContractAddress());
            result.setTransactionHash(transactionHash);
            result.setImageHash(imageHash);
            result.setMetadataHash(metadataHash);
            result.setMetadata(metadata);
            result.setMintTime(LocalDateTime.now());
            result.setNetwork(nftConfig.getNetwork());
            result.setMintCost(calculateMintCost(nftConfig.getNetwork()));
            
            return result;
            
        } catch (Exception e) {
            log.error("NFT铸造失败: {}", nftConfig.getName(), e);
            return createMintErrorResult("铸造失败: " + e.getMessage());
        }
    }

    /**
     * 区块链存证
     *
     * @param imageUrl 图片URL
     * @param proofConfig 存证配置
     * @return 存证结果
     */
    public static BlockchainProofResult createProof(String imageUrl, ProofConfig proofConfig) {
        try {
            log.info("开始区块链存证: {}", imageUrl);
            
            // 1. 计算图片哈希
            String imageHash = calculateImageHash(imageUrl);
            
            // 2. 创建存证数据
            ProofData proofData = new ProofData();
            proofData.setImageUrl(imageUrl);
            proofData.setImageHash(imageHash);
            proofData.setOwner(proofConfig.getOwner());
            proofData.setTimestamp(System.currentTimeMillis());
            proofData.setDescription(proofConfig.getDescription());
            proofData.setProofId(IdUtil.fastSimpleUUID());
            
            // 3. 上链存证
            String transactionHash = submitProofToBlockchain(proofData, proofConfig);
            
            // 4. 生成存证证书
            ProofCertificate certificate = generateProofCertificate(proofData, transactionHash);
            
            BlockchainProofResult result = new BlockchainProofResult();
            result.setSuccess(true);
            result.setProofId(proofData.getProofId());
            result.setImageHash(imageHash);
            result.setTransactionHash(transactionHash);
            result.setProofData(proofData);
            result.setCertificate(certificate);
            result.setNetwork(proofConfig.getNetwork());
            result.setProofTime(LocalDateTime.now());
            
            return result;
            
        } catch (Exception e) {
            log.error("区块链存证失败: {}", imageUrl, e);
            return createProofErrorResult("存证失败: " + e.getMessage());
        }
    }

    /**
     * 版权确权
     *
     * @param imageUrl 图片URL
     * @param copyrightConfig 版权配置
     * @return 确权结果
     */
    public static CopyrightResult registerCopyright(String imageUrl, CopyrightConfig copyrightConfig) {
        try {
            log.info("开始版权确权: {}", copyrightConfig.getTitle());
            
            // 1. 创建版权信息
            CopyrightInfo copyrightInfo = new CopyrightInfo();
            copyrightInfo.setTitle(copyrightConfig.getTitle());
            copyrightInfo.setAuthor(copyrightConfig.getAuthor());
            copyrightInfo.setCreationDate(copyrightConfig.getCreationDate());
            copyrightInfo.setDescription(copyrightConfig.getDescription());
            copyrightInfo.setImageUrl(imageUrl);
            copyrightInfo.setImageHash(calculateImageHash(imageUrl));
            copyrightInfo.setCopyrightId(IdUtil.fastSimpleUUID());
            
            // 2. 数字签名
            String digitalSignature = createDigitalSignature(copyrightInfo, copyrightConfig.getPrivateKey());
            copyrightInfo.setDigitalSignature(digitalSignature);
            
            // 3. 上链注册
            String transactionHash = registerCopyrightOnChain(copyrightInfo, copyrightConfig);
            
            // 4. 生成版权证书
            CopyrightCertificate certificate = generateCopyrightCertificate(copyrightInfo, transactionHash);
            
            CopyrightResult result = new CopyrightResult();
            result.setSuccess(true);
            result.setCopyrightId(copyrightInfo.getCopyrightId());
            result.setTransactionHash(transactionHash);
            result.setCopyrightInfo(copyrightInfo);
            result.setCertificate(certificate);
            result.setRegistrationTime(LocalDateTime.now());
            result.setNetwork(copyrightConfig.getNetwork());
            
            return result;
            
        } catch (Exception e) {
            log.error("版权确权失败: {}", copyrightConfig.getTitle(), e);
            return createCopyrightErrorResult("确权失败: " + e.getMessage());
        }
    }

    /**
     * NFT交易
     *
     * @param tradeConfig 交易配置
     * @return 交易结果
     */
    public static NFTTradeResult tradeNFT(NFTTradeConfig tradeConfig) {
        try {
            log.info("开始NFT交易: {} -> {}", tradeConfig.getFromAddress(), tradeConfig.getToAddress());
            
            // 1. 验证NFT所有权
            boolean ownershipValid = verifyNFTOwnership(tradeConfig.getTokenId(), tradeConfig.getFromAddress());
            if (!ownershipValid) {
                return createTradeErrorResult("NFT所有权验证失败");
            }
            
            // 2. 检查交易条件
            boolean conditionsValid = validateTradeConditions(tradeConfig);
            if (!conditionsValid) {
                return createTradeErrorResult("交易条件不满足");
            }
            
            // 3. 执行链上交易
            String transactionHash = executeNFTTrade(tradeConfig);
            
            // 4. 更新所有权记录
            updateOwnershipRecord(tradeConfig.getTokenId(), tradeConfig.getToAddress());
            
            NFTTradeResult result = new NFTTradeResult();
            result.setSuccess(true);
            result.setTokenId(tradeConfig.getTokenId());
            result.setFromAddress(tradeConfig.getFromAddress());
            result.setToAddress(tradeConfig.getToAddress());
            result.setPrice(tradeConfig.getPrice());
            result.setCurrency(tradeConfig.getCurrency());
            result.setTransactionHash(transactionHash);
            result.setTradeTime(LocalDateTime.now());
            result.setNetwork(tradeConfig.getNetwork());
            
            return result;
            
        } catch (Exception e) {
            log.error("NFT交易失败", e);
            return createTradeErrorResult("交易失败: " + e.getMessage());
        }
    }

    /**
     * 查询NFT信息
     *
     * @param tokenId 代币ID
     * @param contractAddress 合约地址
     * @param network 网络
     * @return NFT信息
     */
    public static NFTInfo queryNFTInfo(String tokenId, String contractAddress, String network) {
        try {
            log.info("查询NFT信息: {} on {}", tokenId, network);
            
            // 1. 查询链上数据
            JSONObject chainData = queryChainData(tokenId, contractAddress, network);
            
            // 2. 获取元数据
            String metadataUri = chainData.getStr("tokenURI");
            NFTMetadata metadata = fetchMetadata(metadataUri);
            
            // 3. 查询所有权历史
            List<OwnershipHistory> ownershipHistory = queryOwnershipHistory(tokenId, contractAddress, network);
            
            // 4. 查询交易历史
            List<TradeHistory> tradeHistory = queryTradeHistory(tokenId, contractAddress, network);
            
            NFTInfo nftInfo = new NFTInfo();
            nftInfo.setTokenId(tokenId);
            nftInfo.setContractAddress(contractAddress);
            nftInfo.setNetwork(network);
            nftInfo.setCurrentOwner(chainData.getStr("owner"));
            nftInfo.setMetadata(metadata);
            nftInfo.setOwnershipHistory(ownershipHistory);
            nftInfo.setTradeHistory(tradeHistory);
            nftInfo.setCreationTime(LocalDateTime.parse(chainData.getStr("creationTime")));
            nftInfo.setLastUpdateTime(LocalDateTime.now());
            
            return nftInfo;
            
        } catch (Exception e) {
            log.error("查询NFT信息失败: {}", tokenId, e);
            return createNFTInfoError("查询失败: " + e.getMessage());
        }
    }

    /**
     * 创建数字藏品市场
     *
     * @param marketConfig 市场配置
     * @return 市场创建结果
     */
    public static MarketplaceResult createMarketplace(MarketplaceConfig marketConfig) {
        try {
            log.info("创建数字藏品市场: {}", marketConfig.getName());
            
            // 1. 部署市场智能合约
            String contractAddress = deployMarketplaceContract(marketConfig);
            
            // 2. 初始化市场参数
            initializeMarketplace(contractAddress, marketConfig);
            
            // 3. 设置手续费和分成
            configureFees(contractAddress, marketConfig);
            
            MarketplaceResult result = new MarketplaceResult();
            result.setSuccess(true);
            result.setMarketplaceId(IdUtil.fastSimpleUUID());
            result.setName(marketConfig.getName());
            result.setContractAddress(contractAddress);
            result.setOwner(marketConfig.getOwner());
            result.setNetwork(marketConfig.getNetwork());
            result.setCreationTime(LocalDateTime.now());
            result.setFeeRate(marketConfig.getFeeRate());
            
            return result;
            
        } catch (Exception e) {
            log.error("创建数字藏品市场失败: {}", marketConfig.getName(), e);
            return createMarketplaceErrorResult("创建失败: " + e.getMessage());
        }
    }

    /**
     * 批量铸造NFT
     *
     * @param imageUrls 图片URL列表
     * @param batchConfig 批量配置
     * @return 批量铸造结果
     */
    public static BatchMintResult batchMintNFT(List<String> imageUrls, BatchNFTConfig batchConfig) {
        try {
            log.info("开始批量铸造NFT: {} 张", imageUrls.size());
            
            List<CompletableFuture<NFTMintResult>> futures = new ArrayList<>();
            
            for (int i = 0; i < imageUrls.size(); i++) {
                String imageUrl = imageUrls.get(i);
                NFTConfig nftConfig = createNFTConfigFromBatch(batchConfig, i);
                
                CompletableFuture<NFTMintResult> future = CompletableFuture.supplyAsync(() -> 
                    mintNFT(imageUrl, nftConfig));
                futures.add(future);
            }
            
            // 等待所有铸造完成
            List<NFTMintResult> results = futures.stream()
                .map(CompletableFuture::join)
                .collect(ArrayList::new, ArrayList::add, ArrayList::addAll);
            
            // 统计结果
            long successCount = results.stream().mapToLong(r -> r.getSuccess() ? 1 : 0).sum();
            long failCount = results.size() - successCount;
            
            BatchMintResult batchResult = new BatchMintResult();
            batchResult.setSuccess(failCount == 0);
            batchResult.setTotalCount(results.size());
            batchResult.setSuccessCount((int) successCount);
            batchResult.setFailCount((int) failCount);
            batchResult.setResults(results);
            batchResult.setBatchId(IdUtil.fastSimpleUUID());
            batchResult.setMintTime(LocalDateTime.now());
            
            return batchResult;
            
        } catch (Exception e) {
            log.error("批量铸造NFT失败", e);
            return createBatchMintErrorResult("批量铸造失败: " + e.getMessage());
        }
    }

    // ==================== 私有辅助方法 ====================

    /**
     * 上传图片到IPFS
     */
    private static String uploadToIPFS(String imageUrl) {
        try {
            // 模拟IPFS上传
            String hash = DigestUtil.sha256Hex(imageUrl + System.currentTimeMillis());
            log.info("图片已上传到IPFS: {}", hash);
            return hash;
        } catch (Exception e) {
            log.error("IPFS上传失败", e);
            throw new RuntimeException("IPFS上传失败", e);
        }
    }

    /**
     * 创建NFT元数据
     */
    private static NFTMetadata createNFTMetadata(NFTConfig config, String imageHash) {
        NFTMetadata metadata = new NFTMetadata();
        metadata.setName(config.getName());
        metadata.setDescription(config.getDescription());
        metadata.setImage(IPFS_GATEWAY + imageHash);
        metadata.setAttributes(config.getAttributes());
        metadata.setExternalUrl(config.getExternalUrl());
        metadata.setCreator(config.getCreator());
        metadata.setCreationDate(LocalDateTime.now());
        return metadata;
    }

    /**
     * 上传元数据到IPFS
     */
    private static String uploadMetadataToIPFS(NFTMetadata metadata) {
        try {
            String metadataJson = JSONUtil.toJsonStr(metadata);
            String hash = DigestUtil.sha256Hex(metadataJson);
            log.info("元数据已上传到IPFS: {}", hash);
            return hash;
        } catch (Exception e) {
            log.error("元数据IPFS上传失败", e);
            throw new RuntimeException("元数据IPFS上传失败", e);
        }
    }

    /**
     * 链上铸造NFT
     */
    private static String mintNFTOnChain(NFTConfig config, String metadataHash) {
        try {
            // 模拟智能合约调用
            String transactionHash = "0x" + DigestUtil.sha256Hex(config.getName() + System.currentTimeMillis());
            log.info("NFT铸造交易已提交: {}", transactionHash);
            return transactionHash;
        } catch (Exception e) {
            log.error("链上铸造失败", e);
            throw new RuntimeException("链上铸造失败", e);
        }
    }

    /**
     * 计算图片哈希
     */
    private static String calculateImageHash(String imageUrl) {
        return DigestUtil.sha256Hex(imageUrl + "image_content");
    }

    /**
     * 生成代币ID
     */
    private static String generateTokenId() {
        return String.valueOf(System.currentTimeMillis() % 1000000);
    }

    /**
     * 计算铸造成本
     */
    private static BigDecimal calculateMintCost(String network) {
        switch (network.toLowerCase()) {
            case "ethereum":
                return new BigDecimal("0.05");
            case "polygon":
                return new BigDecimal("0.001");
            case "bsc":
                return new BigDecimal("0.002");
            default:
                return new BigDecimal("0.01");
        }
    }

    // 其他辅助方法的模拟实现
    private static String submitProofToBlockchain(ProofData proofData, ProofConfig config) { return "0x" + IdUtil.fastSimpleUUID(); }
    private static ProofCertificate generateProofCertificate(ProofData proofData, String txHash) { return new ProofCertificate(); }
    private static String createDigitalSignature(CopyrightInfo info, String privateKey) { return DigestUtil.sha256Hex(info.toString()); }
    private static String registerCopyrightOnChain(CopyrightInfo info, CopyrightConfig config) { return "0x" + IdUtil.fastSimpleUUID(); }
    private static CopyrightCertificate generateCopyrightCertificate(CopyrightInfo info, String txHash) { return new CopyrightCertificate(); }
    private static boolean verifyNFTOwnership(String tokenId, String address) { return true; }
    private static boolean validateTradeConditions(NFTTradeConfig config) { return true; }
    private static String executeNFTTrade(NFTTradeConfig config) { return "0x" + IdUtil.fastSimpleUUID(); }
    private static void updateOwnershipRecord(String tokenId, String newOwner) { }
    private static JSONObject queryChainData(String tokenId, String contract, String network) { return new JSONObject(); }
    private static NFTMetadata fetchMetadata(String uri) { return new NFTMetadata(); }
    private static List<OwnershipHistory> queryOwnershipHistory(String tokenId, String contract, String network) { return new ArrayList<>(); }
    private static List<TradeHistory> queryTradeHistory(String tokenId, String contract, String network) { return new ArrayList<>(); }
    private static String deployMarketplaceContract(MarketplaceConfig config) { return "0x" + IdUtil.fastSimpleUUID(); }
    private static void initializeMarketplace(String contract, MarketplaceConfig config) { }
    private static void configureFees(String contract, MarketplaceConfig config) { }
    private static NFTConfig createNFTConfigFromBatch(BatchNFTConfig batchConfig, int index) { return new NFTConfig(); }

    // 错误结果创建方法
    private static NFTMintResult createMintErrorResult(String error) { 
        NFTMintResult result = new NFTMintResult(); 
        result.setSuccess(false); 
        result.setErrorMessage(error); 
        return result; 
    }
    private static BlockchainProofResult createProofErrorResult(String error) { return new BlockchainProofResult(); }
    private static CopyrightResult createCopyrightErrorResult(String error) { return new CopyrightResult(); }
    private static NFTTradeResult createTradeErrorResult(String error) { return new NFTTradeResult(); }
    private static NFTInfo createNFTInfoError(String error) { return new NFTInfo(); }
    private static MarketplaceResult createMarketplaceErrorResult(String error) { return new MarketplaceResult(); }
    private static BatchMintResult createBatchMintErrorResult(String error) { return new BatchMintResult(); }
}
